自定义基座出问题

[HBuilder] 20:06:50.211 warnings when minifying css:
[HBuilder] 20:06:50.214 > <stdin>:36:0: warning: "@charset" must be the first rule in the file
[HBuilder] 20:06:50.243 36 │ @charset "UTF-8";
[HBuilder] 20:06:50.244 ╵ ~~~~
[HBuilder] 20:06:50.272 <stdin>:31:0: note: This rule cannot come before a "@charset" rule
[HBuilder] 20:06:50.274 31 │ .uni-icons[data-v-afb01c98] {
[HBuilder] 20:06:50.311 ╵ ^
[HBuilder] 20:06:50.313 warnings when minifying css:
[HBuilder] 20:06:50.346 > <stdin>:36:0: warning: "@charset" must be the first rule in the file
[HBuilder] 20:06:50.347 36 │ @charset "UTF-8";
[HBuilder] 20:06:50.371 ╵ ~~~~
[HBuilder] 20:06:50.376 <stdin>:31:0: note: This rule cannot come before a "@charset" rule
[HBuilder] 20:06:50.404 31 │ .uni-icons[data-v-afb01c98] {
[HBuilder] 20:06:50.412 ╵ ^
[HBuilder] 20:06:50.436 (x2)
不知道这是啥问题